According to the problems existing in the operation of the system, the corresponding improvement suggestions are put forward. 1 The environmental protection facilities of coal-fired boilers, a flue gas seawater desulfurization system, the Shenzhen Mawan Power Plant has put into operation four sets of 300MW domestically introduced units, all of which are Harbin power equipment. The boiler is burned with Shanxi Jinbei bituminous coal. The condensing medium of the steam turbine is seawater. The No. 4 unit was put into operation in November 1997. Later, in order to ensure the emission of flue gas meets environmental protection requirements, the flue gas seawater desulfurization system was installed. This is the first in China. The unit adopting flue gas seawater desulfurization technology was identified as “demonstration project†by the State Environmental Protection Administration. Since the system was officially put into operation in April 1999, the operation has been better, and the sulfur content of the emitted flue gas (1)(s) < 20 (1ff6, desulfurization efficiency of more than 90%; discharge seawater quality pH value is greater than 65, oxygen content up to 3mg / L or more through the ocean continuous monitoring, no pollution was found to marine resources; through regular inspection of equipment, no discovery Equipment corrosion and lining material damage 2 System problems and improved operation of flue gas seawater desulfurization system, achieved good environmental protection but running Some problems have also been found. 2.1 Absorption tower bottom pool water level is too high. Absorption tower bottom pool water level is not allowed to be higher than 2 8m. Otherwise, there will be more factors affecting the inlet tower flue affecting the water level, including the inlet tower seawater flow and aeration. The seawater flow rate and water level, the resistance of the absorption tower to the aeration tank, the number of openings and pore diameter of the distribution pipe, the tide of the seawater, the flow of the flue gas of the absorption tower, and the pressure of the flue gas increase the opening of the distribution pipe. The number and the aperture, but the effect is not obvious. After using the absorption of the electric gate of the absorption tower seawater booster pump to control the water level, there is a certain effect to fundamentally solve this problem, which can be started from two aspects: a reduce the absorption tower Inlet seawater flow rate. The absorption tower seawater booster pump can be changed to a booster pump with a smaller output, or a recirculation pipe can be installed at the outlet of the booster pump; reducing the water level in the aeration tank can reduce the overflow of each flow channel outlet. The water level of each channel in the aeration tank can also reduce some water levels by controlling the flow of seawater.
2.2 When the load is high, the booster fan suddenly exceeds the force. If the desulfurization system inlet pressure is set too low, and the bypass baffle is not completely closed or mis-opened, the treated large amount of flue gas is returned to the supercharged state. The fan inlet causes the booster fan to exceed the force.
The flue gas reflux is caused by the outlet pressure of the desulfurization system being higher than the inlet pressure. The outlet pressure of the desulfurization system is affected by external atmospheric pressure, the flue gas flow rate of No. 3 furnace and No. 4 furnace. The inlet pressure can be adjusted by the booster fan, so the booster fan overrun solution should be to continuously adjust the inlet pressure of the desulfurization system to track its outlet pressure to prevent flue gas recirculation. 2.3 Seawater discharge water quality monitoring device is vulnerable to seawater discharge. The solution is large in flow and rapid in water flow. The solution for damage to the monitoring device caused by seawater scouring is to install seawater monitoring devices at the five outlets of the aeration tank. By monitoring the water quality of each channel, the water quality is comprehensively evaluated. The seawater emission standard 2.4 control system needs to be improved. a. The lighter used in the fuel injection is lighter. The light oil has a higher sulfur content and the unburned oil droplets tend to adhere to the desulfurization equipment and affect the health of the equipment. When the desulfurization system can only be stopped manually, some modifications can be made in the program logic. When the two oil guns are running, they will automatically stop and no longer extend forward. Stabilizing the wedge surface also helps to offset the offset during shaft operation and maintain shaft stability. Compared with the traditional single-oil wedge surface structure, the oil wedge surface becomes narrower, the oil wedge pressure increases, and the top clearance between the shaft and the tile is reduced. When the shaft runs to the top, there is also a high-pressure oil film Yongxing power plant unit speed. 88.24r/min, the maximum oil film pressure is 5.57MPa, which is smaller than the allowable stress of the elastic plastic tile of 8.03MPa, which indicates that the bearing capacity of the elastic plastic tile is enough to meet the requirements of the radial bearing; the minimum oil film thickness is 37.4mm, which is the smallest oil film. The thickness of 20.43mm is large, which indicates that the oil film formation is good at the moment of starting, and the high-pressure oil jacking device can be eliminated. At the same time, due to the multi-wedge surface bearing structure, the influence of thermal deformation is alleviated, and the oil film stability during the hot running state of the bearing bush can be maintained.
5 Application and promotion The guide bearing bush and thrust bearing spring-plastic tile designed and manufactured according to the above principle were installed and debugged during the overhaul of Yongxing Power Station. After the startup was successfully cancelled, the high-pressure oil jacking operation was cancelled, which simplified the startup procedure. The oil temperature and the temperature of the tile are normal. After 4 000 hours of full load operation, the normal practice proves that the elastic plastic tile has been successfully used in the application of the 860mm large diameter horizontal hydroelectric generator. Up to now, the unit has been in operation for more than one year, the operating temperature is normal, the output is stable, and the problem of limited load operation due to the large temperature of the Wahwa has been solved, and good operation results and economic benefits have been obtained. In 2001, the annual power generation of Yongxing Power Station was 148 million. kW.h, the annual utilization of 4930h, the best level of history, the operation of the large-axis radial core elastic plastic tile has provided a good precedent for the full-spring plastic tile operation of the horizontal hydro-generator unit.
(Continued from page 54) Sulfur system shutdown When the dust removal effect is deteriorated or tripped, the ash content assembly will cause great harm to the desulfurization equipment, and the desulfurization system cannot detect this change and can be operated by the electric dedusting electric field. Logarithm establishes the dust removal effect model, and automatically trips the desulfurization system when the electric field is out of logarithm. When the SO2 exceeds the standard in the flue gas or the discharged seawater quality is unqualified and exceeds the processing capacity of the desulfurization system, manual intervention can only be performed. When SO2 or water quality exceeds the specified level, a forced signal is introduced to open the bypass baffle, and a part of the untreated flue gas is directly discharged into the chimney bypass baffle and the inlet fan of the booster fan. The coordinated control can be different through test. Under the load situation, the curve relationship between the two establishes the control function to achieve the coordinated control between the two. 2.5 baffle control air source pressure unstable compressed air as the operating power of the desulfurization system baffle, its pressure stability is significant to the system The original design is provided by the air compressor of the ash removal system. In the operation, it is found that the pressure instability can be changed by the host compressed air system. Because the air volume of the baffle is small, it will not affect the host system. A digital journal group's statement In order to realize the electronicization of scientific journals, publishing and publishing, and to promote the networked process of scientific and technological information exchange, our magazine has entered the "Wanfang Data-Digital Journal Group", so it is submitted to the journal and accepted. The manuscript articles will be uniformly included in the “Wanfang Data-Digital Journal Group†to enter the Internet to provide information services. Anyone who disagrees, please vote for another publication. The remuneration paid by this journal contains the content of the publication, and the payment for online services is no longer payable.
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